http://www.softschools.com/formulas/physics/magnetic_field_formula/343/ http://www.softschools.com/formulas/physics/magnetic_field_f... the strength of the mag

http://www.softschools.com/formulas/physics/magnetic_field_formula/343/ http://www.softschools.com/formulas/physics/magnetic_field_f... the strength of the magnetic field is equal to the (current times the permeability of the medium) divided by (the distance times 2 pi). magnetic flux is the dot product of the magnetic field and the area vector representing the area through which you want the flux. theres another way to express flux as a ?derivative of voltage? but I can't find a reference and the exact relationship escapes me at the moment.